CN201794214U - Prefabricated beam with cavity - Google Patents
Prefabricated beam with cavity Download PDFInfo
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- CN201794214U CN201794214U CN 201020554374 CN201020554374U CN201794214U CN 201794214 U CN201794214 U CN 201794214U CN 201020554374 CN201020554374 CN 201020554374 CN 201020554374 U CN201020554374 U CN 201020554374U CN 201794214 U CN201794214 U CN 201794214U
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- precast beam
- cavity
- hole
- precast
- wall thickness
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Abstract
The utility model relates to a prefabricated beam with a cavity; the body of the prefabricated beam is internally provided with a plurality of cavities distributed along the length direction of the body; and the cavities are isolated from one another. In the prefabricated beam, the body is distributed with a plurality of mutually isolated cavities along the length direction of the body; and the design greatly reduces the weight of the beam based on no influence on the mechanical behavior of the beam, thereby not only reducing the whole material and reducing the cost but also facilitating transportation and hoisting.
Description
Technical field
The utility model relates to the building structural element in a kind of building trade, particularly a kind of precast beam that has cavity.
Background technology
For prefabricated compound beam, steel-concrete compound beam and steel bar concrete superposed beam are arranged in the prior art, precast beam can be produced on a large scale, can effectively reduce cost, improves efficiency of construction.But precast beam also exists the lifting trouble, and problems such as inconvenience, globality difference are installed.So also do not have the precast beam that utilizes of system to build the integral framework in house so far, this also causes precast beam to fail to be adopted in a large number in reality is built.In addition, the beam of precast beam is great, lifting is inconvenient, freight is high, especially for the bigger beam of width, has and goes back precast beam and connecting of other member the low reliable again mode of neither one cost so far.
The utility model content
In order to overcome above-mentioned deficiency of the prior art, the utility model provides a kind of precast beam that has cavity
The main technical schemes that the utility model adopts is: a kind of precast beam that has cavity, have a plurality of cavitys that distribute along the body length direction in its body, and a plurality of described cavitys are spaced from each other.
The utility model also adopts following attached technical scheme: the vertical side walls of described precast beam at interval be provided with fin, described fin is arranged in described cavity;
The wall thickness on cavity top that is positioned at described precast beam stage casing is more than or equal to the wall thickness on the described cavity top that is positioned at described precast beam two ends;
Described precast beam end 300mm is a solid to the position of 800mm;
Be equipped with tub, cement fibrolite plate box or foam block in the described cavity;
Be embedded with described prestress wire in the bottom wall thickness of described cavity, also be embedded with described prestress wire or high tensile steel wire in the wall thickness of top;
The body of described precast beam is provided with stirrup, and described stirrup partly stretches out the upper surface of described beam body;
The end of described precast beam is embedded with shaped steel, and the part of described shaped steel is embedded in the described beam body, and remainder is placed on the end of described beam body;
The body of described precast beam is provided with and is suitable for the through hole that is connected with the external beam end of body, described through hole is a rectangular through-hole, protrude to the center at the middle part of described rectangular through-hole, the bellmouth orifice that formation is extended to the end from the rectangular through-hole middle part, described rectangular opening both sides 200mm is a solid to the position of 500mm;
The end of described precast beam has breach, and the degree of depth of described breach is 50mm to 150mm.
The beneficial effect that adopts the utility model to bring is: the precast beam that (1) the utility model provides, body is distributed with a plurality of cavitys spaced apart from each other along its length, this design is on the basis of the stress performance that does not influence beam, greatly reduce the deadweight of beam, not only make whole materials minimizing, cost reduce, and make things convenient for transporting and hoisting.(2) on the vertical side walls of precast beam at interval be provided with fin, fin is arranged in cavity, can increase the rigidity of sidewall, can make sidewall thin as far as possible not influencing under the stressed situation of beam body, but rib double as concrete waters the insert division of smashing vibrator.(3) cavity at a plurality of intervals has dividing plate between each cavity, and dividing plate can effectively improve the globality and the rigidity of beam body.(4) wall thickness on cavity top, beam body stage casing is greater than the wall thickness on cavity top, both sides: the pressure at two ends on construction stage beam top is little and middle part pressure is big, therefore make the wall thickness on cavity top, beam body stage casing greater than the wall thickness on cavity top, both sides (be top, two ends concrete thin and the middle part concrete is thick) thus the member deadweight that further alleviates precast beam.(5) adopt prestress wire can guarantee to have under the situation of same intensity, reduce the steel using amount of main muscle, precast beam is made in factory with the pretensioned prestressing technology, can be in factory mass production, thus the reduction cost.(6) be equipped with tub, cement fibrolite plate box or foam block in cavity, purpose is to form cavity when producing, thereby reduces the beam body weight, and foam block plasticity is strong, to do groove easy.(7) beam end is buried connector, can make the precast beam installation in position convenient.The double again shearing resistance part of doing the old and new's concrete bonding surface of this connector simultaneously.
Description of drawings
Fig. 1 is the overall structure figure of the hollow precast beam of the utility model;
Fig. 2 is the side sectional view of the hollow precast beam of the utility model;
Fig. 3 is the transverse sectional view of the hollow precast beam of the utility model;
Fig. 4 is the vertical cross-sectional of the hollow precast beam of the utility model;
Fig. 5 is the part-structure figure of the hollow precast beam of the utility model;
Fig. 6 is the vertical structure figure of the hollow precast beam of the utility model;
Fig. 7 looks sectional view for the hollow precast beam of the utility model on the left side of lead to the hole site.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is done further detailed description:
To shown in Figure 6, be a kind of precast beam that has cavity that the utility model provides as Fig. 1, have a plurality of cavitys 2 that distribute along the body length direction in its body 1, a plurality of described cavitys 2 are spaced from each other.Cavity 2 a plurality of spaced apart from each other in the precast beam body 1 on the basis that does not reduce the precast beam stress performance, greatly reduces the deadweight of precast beam, and saves material, reduces cost, and also is convenient to transportation and lifting.
In the present embodiment, the vertical side walls of described precast beam at interval be provided with fin 3, described fin 3 is arranged in described cavity 2.Fin 3 can increase the rigidity of sidewall, can make sidewall thin as far as possible not influencing under the stressed situation of beam body, does thinly not influencing the sidewall thickness that can make precast beam under the stressed situation of beam body 1, further saves material, reduces cost.In addition, also, the construction stage concrete provides convenience for watering when smashing the use of vibrator.
The wall thickness on cavity 2 tops that is positioned at described precast beam stage casing is greater than the wall thickness on described cavity 2 tops that are positioned at described precast beam both sides.Pressure at two ends on construction stage precast beam top is little and middle part pressure is big, makes the structure of cavity 2 top wall thickness in two ends less than stage casing cavity 2 top wall thickness (be top, both sides concrete thin and top, stage casing concrete is thick), the deadweight that can further alleviate precast beam.From figure, the distribution trend of precast beam cavity 2 be in the middle of one section cavity 2 placed in the middle, and the cavity 2 that the cavity 2 on both sides is compared the stage casing except that the stage casing exceeds a part on horizontal level.
The body of described precast beam is provided with stirrup 6, and described stirrup 6 parts are stretched out the upper surface of described beam body 1.Described precast beam end 300mm is a solid to the position of 800mm, this position is embedded with shaped steel 7, it is external that the part of shaped steel 7 is stretched out beam, another part is embedded in the position of above-mentioned end solid, shaped steel 7 as with outside other members between be connected usefulness, such as connections such as post or other girder, H girder steels.
Be embedded with described prestress wire 5 in the bottom wall thickness of described cavity 2.The top of described beam body 1 also is embedded with prestress wire 5 ' or the steel wire that adopts the pre-tensioning system construction, beam body 1 bottom steel strand 5 are used to make precast beam to produce prestressing force in the present invention, the steel strand on top ' be used for the recurvation square that balance bottom steel strand 5 are put a generation, make beam body 1 upper surface avoid when bottom steel strand 5 are put, producing the crack.For reduce upper steel twisted wire 5 ' when putting to the concrete local failure, can spiral hoop be set in the position that the upper steel twisted wire stretches out beam body 1 end.Described spiral hoop strengthens the local strength of its position, thereby can eliminate the destruction of upper steel twisted wire to the concrete part, has improved safety.Certainly, described upper steel twisted wire also can be high-tensile steel wires.
Because the end of beam body 1 and the gap of external member are very little, can't make precast beam accurately in place after steel strand and outside reinforcing bar are collided.For this reason, the present invention is provided with breach 12 in steel strand 5 extending areas, and steel strand 5 are crooked in breach 12, thereby make steel strand 5 when colliding with external member, and it can bending avoid external member.Referring to Fig. 5, the degree of depth L1 of described breach 12 is 50mm-150mm.Present embodiment is 100mm.This breach is a small gap, and this small gap can satisfy the crooked needed space of steel strand trace.The stirrup 6 in the beam body 1 can be effectively avoided in the setting of above-mentioned size, in order to avoid stirrup 6 spacings impact in 12 pairs of beam bodies of this breach 1.This small gap scheme mainly is arranged on the end of girder.And concern that at the installation of secondary beam and girder the steel strand of secondary beam need a bigger curved space, and could guarantee that the steel strand of secondary beam stretch in the girder, realize both effective connections.Therefore, during at secondary beam, the degree of depth L1 of described breach 12 is 200mm-400mm, and present embodiment is 300mm, is called big breach again.
Simultaneously, the present invention buries sleeve pipe 9 underground in the end of described beam body 1, makes part bottom steel strand 5 pass sleeve pipe 9.Sleeve pipe 9 is set, and can to effectively reduce the local prestressing force of beam end of body when the production phase excessive, eliminates this place and produce the crack, owing to can reduce the recurvation square of beam end of body, makes the pre-tensile stress of end upper surface of beam body reduce, thereby prevent to produce the crack.And,, can prevent that beam end of body bottom concrete is destroyed less than the compressive strength of concrete after the compressive stress stack that bearing recurvation square feasible and beam produces because the compressive pre-stress that the bottom, end of beam body produces is discharged by sleeve pipe 9 parts in operational phase.
Two ends at beam body 1 in the present embodiment all are provided with sleeve pipe 9, thereby eliminate 5 pairs of destructions that concrete caused of bottom steel strand of two ends of beam body.Make precast beam of the present invention to use, enlarged the scope of application in the earthquake zone.
In the foregoing description that the present invention provides, described sleeve pipe 9 is a plastic bushing, perhaps the sleeve structure that is wrapped to form by outsourcing material.The quantity that is with the bottom steel strand 5 of described sleeve pipe 9 is less than sum, and promptly not all bottom steel strand 5 all are with sleeve pipe.In order to satisfy requirement of the present invention, the quantity of sleeve pipe 9 can be the 1/3-2/3 of steel strand quantity, and present embodiment then 2 two ends in four bottom steel strand 5 is provided with sleeve pipe 9.
Referring to Fig. 4, in the foregoing description that the present invention provides, the described bottom steel strand 5 that are with sleeve pipe 9 on the width of described beam body 1 with the center line symmetric arrangement.Above-mentioned setting can guarantee the left and right sides stress balance of beam body 1, can not produce beam body 1 unbalance stress.
In the foregoing description that the present invention provides, the total length of described sleeve pipe 9 is the 5%-15% of the total length of described beam body 1.The length of described sleeve pipe 9 is excessive, then can influence the prestressing force that beam body 1 is had, too shortly then can not eliminate the destruction of end steel strand 5 for concrete preferably, therefore, the 5%-15% that sleeve pipe 9 total lengths at two ends is limited to the total length of beam body 1 can be good at addressing the above problem.Present embodiment is 7%.
In the process of preparation hollow beam,, can place tub 4, cement fibrolite plate box or foam block in order to form cavity 2.After preparing hollow precast beam, described tub 4, cement fibrolite plate box or foam block just have been contained in the cavity 2.
For connection between better and the beam, the body of described precast beam is provided with and is suitable for the through hole 8 that is connected with the external beam end of body, described through hole 8 is a rectangular through-hole, protrude to the center at the middle part of described rectangular through-hole, the bellmouth orifice that formation is extended to the end from the rectangular through-hole middle part, described rectangular opening both sides 200mm is a solid to the position of 500mm.
In the foregoing description that the present invention provides, described precast beam beam body is equipped with a plurality of through holes 8, is used for being connected (calling secondary beam in the following text) with other outside beam bodies.The end of secondary beam links together with described precast beam by described through hole 8.Owing to be provided with described through hole 8, make the steel strand of secondary beam can stretch in the described through hole 8, then together with the end of secondary beam and through hole 8 monobloc casts.Make and more firm the linking together in end of secondary beam improved the globality of structure with precast beam.
In the foregoing description that the present invention provides, to shown in Figure 7, described through hole 8 is a rectangular through-hole as Fig. 5, and protrude to the center at the middle part 801 of described rectangular through-hole, forms the bellmouth orifice that extends to end 802 from rectangular through-hole middle part 801.Described through hole 8 is arranged to horn mouth can better be beneficial to being connected of secondary beam and girder, and described horn mouth shaping template is conveniently stripped.The present invention is owing to be provided with the through hole 8 of double horn degree of lip-rounding formula, and the horn mouth that the place can be passed in the end of the steel strand of secondary beam arrives the horn mouth of an other side, and enlarged footing is anchored at the horn mouth place of an other side.The good integrity that the concrete of building in the through hole 8 of this double horn degree of lip-rounding formula combines with the beam body after being shaped.
Referring to Fig. 5, Fig. 6 and Fig. 7, in the foregoing description that the present invention provides, described beam body 1 is embedded with pre-buried fixture 81 below through hole 8, described pre-buried fixture 81 comprises fixed head 811 that is positioned at described beam body 1 both sides and the junction plate 812 that is connected described fixed head 811.Be welded with shear resisting board 813 on the described fixture 81.Described junction plate 812 is vertical the setting, the described shear resisting board 813 of welding on the fixed head 81.Described shear resisting board 813 welds up at the construction field (site), and precast beam is adding man-hour, and this shear resisting board 813 can't weld in advance in order to transport with easy for installation.Described shear resisting board 813 is cast in inferior beam end, and shear resisting board 813 has strengthened the shear behavior of connected node.
Described through hole 8 is between the cavity 2 of beam body, and its both sides 200mm is a solid to the position of 500mm, and concrete numerical value can be elected 200mm, 250mm, 300mm, 400mm, 45mm as.The width of through hole 8 self is 200mm-400mm, and concrete numerical value can be elected 200mm, 250mm, 300mm, 350mm or 400mm as.The height of through hole self is 200mm-400mm, and concrete numerical value can be elected 200mm, 250mm, 300mm, 350mm or 400mm as.Certainly, when selecting size, be provided with, guarantee that the height of described through hole 8 is no more than 2/3 of beam body overall height according to the overall dimensions of superposed beam.So that described through hole 8 is unlikely to influence the bulk strength of beam body 1.
In the foregoing description that the present invention provides, be provided with a nib 10 on the two side of precast beam, described nib 10 is used to install supporting member, floor and superposed beam, post are put in order and are watered in the process, the whole whole template of watering all can be installed by a nib 10, make most of template need not to be provided with to land bearing frame, template is finished installation at the top, house, and this structure also can realize the purpose that sandwich construction is constructed simultaneously.Therefore, this nib 10 can bear the concrete deadweight as the supporting member of construction stage with superposed beam, has saved to land bearing frame.Need not to be provided with the intensive bearing frames such as scaffold that land, be beneficial to carrying out synchronously of a plurality of operations in house, improved the construction speed in house.Described nib 10 further improved superposed beam raising and cost for speed in house building course and reduced the effect of being played.
Referring to Fig. 1 and Fig. 2, in the foregoing description that the present invention provides, on the described precast beam all nibs 10 are positioned on the same horizon, described nib 10 is through hole, all nibs 10 are arranged on the same horizon, can guarantee that the template that is installed in nib 10 place is in same plane, thereby guarantee the planarization of whole floor.Described nib 10 is through hole, and the support member of template can directly pass, and in the both sides of beam body template is set.Certainly this nib 10 also can be arranged to blind hole, and is provided with respectively in the both sides of beam body, and this blind hole also can be used for mounting template.But being set, the through hole that runs through is optimum scheme, easy to process, use also simpler.
As shown in Figure 5, in the further embodiment that the utility model provides, at the front end of steel strand enlarged footing 51 is set, described enlarged footing 51 is anchored in the concrete of connected node, can improve the anchoring property of steel strand greatly, thereby improves the overall performance of structure.The degree of depth L1 of breach is 100mm.
Claims (10)
1. precast beam that has cavity is characterized in that: have a plurality of cavitys (2) that distribute along the body length direction in its body (1), a plurality of described cavitys (2) are spaced from each other.
2. the precast beam that has cavity according to claim 1 is characterized in that: the vertical side walls of described precast beam at interval be provided with fin (3), described fin (3) is arranged in described cavity (2).
3. the precast beam that has cavity according to claim 1 and 2 is characterized in that: the wall thickness on cavity (2) top that is positioned at described precast beam stage casing is more than or equal to the wall thickness on described cavity (2) top that is positioned at described precast beam two ends.
4. the precast beam that has cavity according to claim 3 is characterized in that: described precast beam end 300mm is a solid to the position of 800mm.
5. the precast beam that has cavity according to claim 4 is characterized in that: be equipped with tub (4), cement fibrolite plate box or foam block in the described cavity (2).
6. the precast beam that has cavity according to claim 1 is characterized in that: be embedded with prestress wire (5) in the bottom wall thickness of described cavity (2), also be embedded with prestress wire (5 ') or high tensile steel wire in the wall thickness of top.
7. the precast beam that has cavity according to claim 1 is characterized in that: the body of described precast beam (1) is provided with stirrup (6), and described stirrup (6) part is stretched out the upper surface of described beam body (1).
8. according to claim 1 or the 4 described precast beams that have cavity, it is characterized in that: the end of described precast beam is embedded with shaped steel (7), and the part of described shaped steel (7) is embedded in the described beam body (1), and remainder is placed on the end of described beam body (1).
9. the precast beam that has cavity according to claim 1, it is characterized in that: the body of described precast beam (1) is provided with and is suitable for the through hole (8) that is connected with the external beam end of body, described through hole (8) is a rectangular through-hole, protrude to the center at the middle part of described rectangular through-hole, the bellmouth orifice that formation is extended to the end from the rectangular through-hole middle part, described rectangular opening both sides 200mm is a solid to the position of 500mm.
10. the precast beam that has cavity according to claim 6 is characterized in that: the end of described precast beam has breach (12), and the degree of depth of described breach (12) is 50mm to 150mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020554374 CN201794214U (en) | 2010-09-28 | 2010-09-28 | Prefabricated beam with cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020554374 CN201794214U (en) | 2010-09-28 | 2010-09-28 | Prefabricated beam with cavity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201794214U true CN201794214U (en) | 2011-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020554374 Expired - Fee Related CN201794214U (en) | 2010-09-28 | 2010-09-28 | Prefabricated beam with cavity |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433960A (en) * | 2011-10-20 | 2012-05-02 | 沈阳建筑大学 | Foam filled reinforced concrete hollow beam |
| CN102852278A (en) * | 2012-08-16 | 2013-01-02 | 杨众 | Double precast beam-superposed frame beam |
| CN104005515A (en) * | 2014-06-11 | 2014-08-27 | 朱彤 | Prefabricated reinforced concrete hollow web girder and construction method thereof |
| CN104179251A (en) * | 2014-07-28 | 2014-12-03 | 南京长江都市建筑设计股份有限公司 | Connection joint of primary precast beam and secondary precast beam comprising T-shaped shear-resistant steel plate as well as connection method |
| CN111561058A (en) * | 2020-06-22 | 2020-08-21 | 宁波优造建筑科技有限公司 | Novel construction method of fabricated mixed frame structure system |
| CN111576255A (en) * | 2020-05-28 | 2020-08-25 | 南京工程学院 | Partially-debonded prestressed reinforced concrete box beam and debonding construction method thereof |
| CN113914333A (en) * | 2021-09-29 | 2022-01-11 | 中国一冶集团有限公司 | Slope protection monomer component, slope protection structure and slope protection construction method |
-
2010
- 2010-09-28 CN CN 201020554374 patent/CN201794214U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433960A (en) * | 2011-10-20 | 2012-05-02 | 沈阳建筑大学 | Foam filled reinforced concrete hollow beam |
| CN102852278A (en) * | 2012-08-16 | 2013-01-02 | 杨众 | Double precast beam-superposed frame beam |
| CN102852278B (en) * | 2012-08-16 | 2016-08-24 | 杨众 | A kind of double precast beam-superposed frame beam |
| CN104005515A (en) * | 2014-06-11 | 2014-08-27 | 朱彤 | Prefabricated reinforced concrete hollow web girder and construction method thereof |
| CN104179251A (en) * | 2014-07-28 | 2014-12-03 | 南京长江都市建筑设计股份有限公司 | Connection joint of primary precast beam and secondary precast beam comprising T-shaped shear-resistant steel plate as well as connection method |
| CN111576255A (en) * | 2020-05-28 | 2020-08-25 | 南京工程学院 | Partially-debonded prestressed reinforced concrete box beam and debonding construction method thereof |
| CN111561058A (en) * | 2020-06-22 | 2020-08-21 | 宁波优造建筑科技有限公司 | Novel construction method of fabricated mixed frame structure system |
| CN113914333A (en) * | 2021-09-29 | 2022-01-11 | 中国一冶集团有限公司 | Slope protection monomer component, slope protection structure and slope protection construction method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: HUAHUI ENGINEERING DESIGN GROUP SHARES CO., LTD. Free format text: FORMER OWNER: YANG FENG Effective date: 20120727 Free format text: FORMER OWNER: HUAHUI ENGINEERING DESIGN GROUP CO., LTD. Effective date: 20120727 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120727 Address after: 312000 Zhejiang Province, Shaoxing Zhongxing Road No. 339 building Huahui Changan Patentee after: Huahui Engineering Design Group Co., Ltd. Address before: 312000 Zhejiang Province, Shaoxing Zhongxing Road No. 339 building Huahui Changan Co-patentee before: Huahui Engineering Design Group Co., Ltd. Patentee before: Yang Feng |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110413 Termination date: 20140928 |
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| EXPY | Termination of patent right or utility model |